anyway instead of using LSDJ on the wii,

you could try schism tracker after you install homebrew on your wii
http://eval.sovietrussia.org/wiki/Schism_Tracker

and also, bring your wii around is also possible
http://www.chinavasion.com/product_info … or-7-inch/
by using this 7 inch portable monitor with built-in sensors, they also have a earpiece jack output, so maybe they can be modded to play live

I was surprised by the quality of the sound (not the random noises that I put in to demonstrate the concept).

It definitely sounds better than the DS emulation I've been hearing so much of recently. But yea, I appreciate that you can't take your TV and Wii on the train with you to make music.